<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 登录表单区域 -->
      <!-- 用ref获取当前表单实例对象 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRul" label-width="0px"  class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
         <!-- 密码 -->
         <el-form-item prop="password">
          <el-input type="password" v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>          
    </div>
  </div>
</template>


<script>
  export default{
    data() {
      return {
        //这是登录表单的数据绑定对象
        loginForm:{
          username:'',
          password:''
        },
        loginFormRul:{
          //验证名称是否合法
          username:[
            { required: true, message: '请输入登录名称', trigger: 'blur' },
            { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
          ],
          //验证密码是否合法
          password:[
            { required: true, message: '请输入登录密码', trigger: 'blur' },
            { min: 5, max: 15, message: '长度在 5 到 15 个字符', trigger: 'blur' }
          ]                                                   
        }
      }
    },
    methods:{
      //点击重置按钮,重置登录表单
      resetLoginForm(){
        this.$refs.loginFormRef.resetFields();
      },
      login(){
        this.$refs.loginFormRef.validate(async valid => {
          if (!valid) return;
          const { data:res } = await this.$http.post('login',this.loginForm);
          if (res.meta.status !== 200) return this.$message.error("登陆失败");
          this.$message.success("登陆成功");
          //1.将登陆成功的 token 保存到客户端的 sessionStorage 中
          // 1.1 项目中除了登录之外的其他API接口,必须在登录之后才能访问
          // 1.2 token 只应在当前网站打开期间生效,所以将 token 保存在 sessionStorage 中
          window.sessionStorage.setItem('token',res.data.token);
          //2.通过编程式导航跳转到后台主页,路由地址是 /home
          this.$router.push('/home')
                   
        });
      }
    }
  }
</script>

<style lang="less" scoped>
  .login_container{
    background-color: #2b4b6b;
    height: 100%;
  }
  .login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-right: 3px ;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
  }
  .avatar_box{
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    img{
      width: 100%;
      height: 100%;
      border-radius:50%;
      background-color: #eee;
    }
  }
  .login_form{
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
 }
 .btns{
    display: flex;
    justify-content: flex-end;
  }
</style>